Why are chillers often used to cool large buildings?

Why are chillers often used to cool large buildings?
 
  a. Chillers use less refrigerant than other units.
  b. Refrigerant piping is small because of low pressures.
  c. Refrigerant piping is small because of high pressure.
  d. Water piping is less expensive to install.

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[Ques. 2] If the area of the plates of a capacitor is increased, the amount of capacitance _____.
 
  a. decreases
  b. increases
  c. stays the same
  d. may increase or decrease

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[Ques. 3] What type of sensor for ammonia provides the best protection for occupied areas?
 
  a. Detector tubes
  b. Solid state electronic
  c. Electrochemical
  d. Infrared devices

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[Ques. 4] An optional process used in mobile refrigeration systems to minimize ripening of produce to extend its shelf
  life is _____.
 
  a. humidity control (HC)
  b. controlled atmosphere (CA)
  c. nitrogen control (NC)
  d. carbon dioxide control (CO2 C)

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[Ques. 5] A fluid commonly used in cryogenic freezing is liquid _____.
 
  a. HCFC-22
  b. nitrogen
  c. carbon monoxide
  d. HFC-134a